package com.itheima.reggie.filter;


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//检查用户是否完成登录
@WebFilter(filterName = "loginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径匹配器
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        String requestURI = request.getRequestURI();
        log.info("拦截到请求"+requestURI);
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"

        };
        boolean check = check(requestURI, urls);
        if (check) {
            log.info("本次请求不需要处理"+requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //页面板登录判断
        if (request.getSession().getAttribute("employee") != null) {
            Long employeeId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(employeeId);
            filterChain.doFilter(request, response);
              return;////这里少了个return，会导致执行完controller之后会继续往下执行，然后报错又被全局异常处理抓取到，最后异常处理就有两个错误信息，一个是插入一样的数据报错，一个是过滤器上获取输出流报错，就返回了两个数据给响应体
        }

        //移动版网页判断
        if (request.getSession().getAttribute("user") != null) {
            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request, response);
            return;////这里少了个return，会导致执行完controller之后会继续往下执行，然后报错又被全局异常处理抓取到，最后异常处理就有两个错误信息，一个是插入一样的数据报错，一个是过滤器上获取输出流报错，就返回了两个数据给响应体
        }
        //通过输出流向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }


    public boolean check(String requestURI, String[] urls) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
                return true;
            }

        }
        return false;
    }
}
